Some PassiveButtons, including those in the GameSettingMenu, register both OnMouseDown and OnMouseUp as a click. This appears to be happening to Windows 10/11 users on Among Us 2023.3.28s, CrowdedMod 2.9.0-rc1, and Reactor 2.1.0. The bug does not exist on CrowdedMod 2.8.0.

(No, my mouse is not broken 😄)

I was able to reproduce the bug and confirm that your PR fixes it.
Your fix will be a part of CM-2.9.0-rc2. Due to our inability to host 15+ player lobbies, 2.9.0 will be released when anyone confirms that 15+ lobbies indeed work without any problems.

Thank you for your contribution! Closing and merging.